An article in The Boston Globe headlined “Surgery offers no advantage for early prostate cancer, study finds” reported on a clinical trial involving 731 men diagnosed with prostate cancer. About half...

An article in The Boston Globe headlined “Surgery offers no advantage for early prostate cancer, study finds” reported on a clinical trial involving 731 men diagnosed with prostate cancer. About half had surgery; the rest were monitored.

After 12 years, nearly 6 percent of men who had immediate surgery died of the cancer, compared with slightly more than 8 percent of those patients who were observed, which was not a great enough difference to reach statistical significance.

1. About how many men were in each category?